The phrase "a certain episode" is correct and usable in written English.
It can be used when referring to a specific event or occurrence without naming it directly, often to create intrigue or maintain ambiguity.
Example: "In a certain episode of the series, the main character faces a moral dilemma that changes everything."
Alternatives: "a particular incident" or "a specific event".
If 8,000 people all record a certain episode of "Fresh Air," then, by golly, it makes 8,000 copies of that audio file at its headquarters.
Moreover, a clustering-based method is proposed to detect emotional responses to a certain episode during events based on the co-occurrences of words as used in tweets and/or articles.
So if I see a friend is watching a certain episode of a show, I can see that it's currently on live TV and I could flip over to it.
Or maybe you remember her (as many people seem to) from a certain episode of Entourage involving a threesome.
Furthermore, though there may be some uncertainty of the exact start of a new depressive episode, we do know the time sequence, i.e. we do know which suicide attempts occurred later in the course independent of the onset of a certain episode.
Invite all of your guests ahead of time, with invitations, or like in a certain episode, a song.
If that makes you think of a parallel with a certain Black Mirror episode where a young girl is prevented from seeing certain things via a brain implant, then you wouldn't be a million miles away.
And then a certain South Park episode aired, and the ginger-bashing movement was off and soaring.
On the internet, it seems to cause embarrassment, or bring up relentless references to a certain South Park episode.
"One of our test subjects said she'd use them if she decided to quit smoking". Inflatable shirts, reminiscent of a certain Seinfeld episode, were center stage in a humorously oddball demo that claimed users would, "feel the weight of a long-winded sentence". Big talkers blew up quickly.
The series usually has a dark atmosphere, though production purposefully created a contrasting appearance for certain episodes.
